Safety device



I Oct. 5, i943. G, A- SCHETTLER 2,330,928

SAFETY DEVICE Filed Deb. 5, 1940 4 sheet-sheet 1 O ct. 5, 1943. c, A. scHETTLER v 2,330,928

- SAFETY DEVICE v Filed Dec. 5, 1940 l 4 sheets-s119612 Oct. 5, 1943. G.' A; scHETTLER v 2,330,928-

SAFETY DEVICE Filed Dc. 5,' 1940 4 sheets-sheet s Oct. 5, 1943. G. A. SCHETTLER i 2,330,928

SAFETY DEVICE Filed Dec. 5, 1940 4 Sheets-Sheet 4 y, Ylm

Patented Oct. 5, 1943 y SAFETY DEVICE Gustav Schettler, Leeds, England, assignor,- to f- The Turner Tanning Machinery Company,

Portland, Maine, a. corporation of Maine I d vApplication December 5, y1940, serial NojsssoL InGreat Britain`February'3, 1940 Y acclaim. -(o1. 19a-,133)

This invention relates to 4the provisionA of safety devices in machines utilized in operations upon work pieces introducedfiinto the machine by a machine attendant. While the invention is illustrated as embodied in a machine wherein work pieces are treatedfby a 4rotary tool and in which the possibility of injury to the attendant isdue largely to a work presenting member movable between work receiving and work presenting positions during rsuccessive half revolutions of a shaft, it is to be understood that the invention and various important features thereof may have other applications and uses.

It is an object of the invention to providea n safety device havingspecial advantages in those machines of the class mentioned above wherein certain moving parts are controlled by stop' motion devices arranged to become operative at predetermined points in the cycle of operations of the machine. In some cases,"a moving part, such as a work presenting member,' is brought to restat the end of a half revolution of its driving means and in other cases kat the end of -a complete revolution of such driving means, such r'novi1.'l,` 10a-rt of ythe machine being returned to i its initial position as a preliminary to a subsequent cycle of the machine. In machines of this type, it is common'to provide a clutch and a brake together with an operating member or members therefor under the control of the stop motion devicathe arrangement being such that a stoplmotion kmember isloperative to hold the clutch engaged and the brake released duringa l civen cycle 'of operations, the arrangement be;``

ing furthersuch that, upon the stop member be-r comingfo'perative to end the cycle, the clutch is automatically disengaged and the brake applied in bringingth'e moving parts of the lmachine to rest. It is'ia further object of this invention provide a safety device which will operate in anfemergency to cause disconnection of- 'the clutch'and application of'the'brake without disturbing operation offthe stop motion devicel To these ends, and in accordance withan im portant feature of ther invention, there is provideda safety device comprising a guardmem# ber having Vconnections to initiate discontinuance of Vthe powerdrive and applicant of a brake device, without'disturbing'operationof the` stop motion device. For the accomplishmentof this purpose, there'is providedl a releasable connectioni between the stop motion device and the member which controls the power means in the starting v'and stoppingof the machine, in an alf-- rangement inwhich the guard member through `'proper operation of these partsin proper connections will tripjthereleasable'connection and thereby effecty disconnection of i the power drive vand` application lof i the brake device, while the stop motion device remains inpotentially operative'condition. It is'to be understood, however, that certain ofthe advantages of the invention may be Aobtained yin'machines which do not embody a brake device because oi the small amount of momentum involved in the moving parts of the machine.

'I'he invention `will'nd its 'chief application in that'class of machines which embody a work presenting member *movablebetween work re- Ceiving position 'and 'workI vpresenting position with respect to a Workitreating member ofthe machine. Sinceinthis class of machinesthe Workfpresenting member shouldcorne to'rest vin each of its two positions, it is common topprovide in suchmachines a stopY motion vdevice to terminate thev movement 'oi such work presenting member andhold 'it' ineach of itspositionrs. It is an important feature ofthe invention, therefore, to :provide in this type of machinera guard vmemberwhich r'will operate under pres-'- sure of theoperators hand .to{ disconnect the power drive and apply thebrak, thus eliminating al1 danger to the operator, while at the same time permitting the stopmotion device tofifunctionA in; the '-normal, manner,` thereby securing thel succeeding cycles `of the machine. y These and other important features of` thefin- ,'i lention and novel combinations fof parts will. g now be described in detail inthe specification Y `and then pointed outtmoie particularlyinthe appended claims.

f In the drawings,

,Figi l` is 'an end elevational view, partly in section.; of aboarding machine, yillustrating V`the (improvedl safety 2 is a verticalgqcro'ss sectional view showing, more` particularly,r the clutch; thastop and clutch operating levers and associated rparts, l the clutch'being engaged andthegfbrake'released;

Fig." 3 is a front elevationallview ot a portion ofthe machine at oneV sideV thereof illustrating the relation of the; safety, guard to the boarding rolls; andmeansfor resetting said guardaiterv it has been trippedfin an emergency; and

Fig. 4 is an endv View of the xnachinershowingA the position of the safety guardin relation ltothe l ,shaft-.9L(sFigsf 1,2-,and,4),-crank arms I9 rshaft and. rodsIIfor connecting, the

mechanism for-movingthe steel table into and out of its operative position.

in the illustrated embodiment ci the invention, specially designed for boarding or graining operations on tanned skins, co-operating top and bottom boarding rolls of themachine are indicated at I and 2, respectively, and 3 represents the work table; The; top boarding'rollfl is mounted' in bearings (not shown) which arev vertically slidable and adjustable within slots `or guideways 4a formed inside frame members such as 4, Whereas the bottom boardingro-ll 2 is mounted-` iri fixed bearings on said frame members 4.Y The rolls are appropriately geared together.

The work table 3 is furnished'- lwith4 a steel plate 5 over which the skins to be boarded or' softened are laid, with approximately'oneehalf of' a'given` ment of which is such that Whenever the clutch skin hanging from the free edge' of the/table.

The steel table 5 is adapted to be reciprocated,

iermoved alternately forwards and backwards' in the conventional manner. When moved forwards, toni-ts furthest extent; the 'Y frontalA edge of-thciplate 5 coincides-*approximately.with lines joining the longitudinal axes of the Vboarding rolls.v ,Asfshown in Fig. @the table 3.r is carried by aj part 6; which .-is.` slidable onl guide rods or bars'l.kv These rodsfor bars v'I may lbe adjustable heightwise to vary the position oi the plate 5 with respect to the space between the rolls, e. g. by means of screw abutmentsY such as.Y that represented'at 8in-Fig, 4. z

BrieflyA considered, thefmechanism for effecting reciprocation of r`the table conveniently consists of a crank. motion comprising. adriven crank on said arms I0 with the slid-ablf'parts 6 on the rods'I.. The forward.. and. ,backwardA movements of the Atable 3 vare'controlledloy a frictionor any other suitable type of clutch whichis associated with the crank shaft-.8 and-'designated generally by tthe reference numeral I2 (Fgsl and 2). This c lutchisoper-- able -,.at,the Willof theoperator by means oi a treadle. Although it is considered ,unnecessary te shew. the needle, thev needle shaft, is however,

represented at lf3 in' Figs. 1k and 2,;While the rear endloffone o the customary levers serving tosuppdrt'the' needle is indicated eti |141 in Fis. '2L As' wlljfbe'seen the lever It supports a `counter WeghtffIE.' For the sake of vsimplicity in illus- 'tration' 'and description, only: the more imp cnj-` f tant parts of the clutch'rnechanisrn areshown the art. Engagement and disengagement of the y al stop lever 2l is provided, this lever being formed jat one end with a protubersnt portion 2Ia dis.-

posee' 'dreontaet at appropriate times' with the peripheraredee ejfeeireuiar disk z2 which latter f .is concentriclwith respect to and rotatable with ariddescr'ibed', Ythe general arrangement of such vmechan'lsrn bein'g understood by 4those skilled in* parftsy are ingen-gagement to drive the shaft 9, during normal running, the portion 2id of the Astopv lever is in Acontact with the peripheral surfaceot thecircularpart 22, as shown in Z.

Upon completion of the half cycle, however, the said. portion 29a, drops into a notch 22a under the action of' the spring 24, thereby turning the leverl It vto effect disengagement: of the clutch and stoppage ci the' machine. Reengagement of theclutch to start the machine again can then only be-e-iected' byLsui-tableactuation of the tread-le to.- turn the leversal and 2.I in a counterclockwise direction (Fig. `21)' against the spring .Heretofore;, in- 'a boardingl and soitening machine of the vcharacterv concerned, the levers IB and Y'2'I havel been positively connected together; but-for the purposeothev present invention they are rn'ade separate'. and-releasably connected by a link device including twof-links: 2% and 2.1; This device is ada-ptedto; lne-operated in an emergency by axncvable safety guard-28 for` the purpose of effecting disconnection ofA they clutch-operating lever-l Hrfromthestop-lever 2 I ,so as to permit oi disengagement ot theclutch and consequent stoppage of; thea machine' withoutdisturbing 'said stopflever 2 I--. -The- 'li-nk 25 is pivotallyconnected to the lower endf'of a downwardly extending arm Iii-bon' th'el-ever I-; and is formed, on is undei side withfa notch Zita-forreeeption of a pin -29 carried by a' Vsmall*lever 3H'.Y Thislever is vin turn pivoted to a bracket 31 attached to one of the side-'frame members I. Similarly'the link 21 is pifvotallyxconnectelf4 at one iend' toi a downwardly extending' arm IIl'bofthe stop lever 2I and also engaged at or near fits other-endf with they pin 29; For the salte4 of :"simpl'icitydnf illustration, the`pin-29 `and the' leverv 3l)A have been" omitted froniFig. l. Assl'irningitheI machine toV be lrunning, then, in the event ofthe linkZSibeing raised #and ,thereby disengaged frornV the pin 29` (as inapplication of the-brake),'while the portion 2Ia of' the-stop lever remains onthefperipheral face of the circular part 272 "due'to the/effect of the ntchedffeadinnetneauy Yopposed points and weighted'arm .2Ic; .i Whenon the `other hand, both of the linkslV and 21 arefimengagement with thev pin- 29,the levers I'G and 2|' will be'oonnectedv in" such' manner Vasv to enablev thorn to function together in the customary manner.

The safety guard 2s is of fweii-known censtruction, comprising a, series `of parallel rods 32 held insuitable spaced relation byarrnsy 33. Said guard is arr'arnged for pivotal movement'about 'a .shaft '34 which is'supp'orted by brackets such `as The' normal position `of fthe 'guard Ais 'indie' cated in Fig. 4.- Inthis gu'refthe- Steel vplate 5 is supposed to be inciting; inwards. toivardsthe rollers Land 2. The danger. point is indicated at Now, in the event of` the operato-r unfortunately lolacilasta his: hands over the frontalV edge of; the plate 5- they will come into contact with tlfielower portion of the' guard 28,.thereby tripping the latter and forcing it,inwards,A i.A e. ina` direction towardsthe rolls i and 2. According; tothe invention, such movement of the guard an emergency will result disconnection of the lever i6 from the stop lever 2i through the inediumrof intermediate. connections new to be described.

To the guard shaft 34, isl rigidlysecu'red av catch lever 36 winch. isv normally maintained ensagement-With an element.-3lo(on or carried by a trip. lever 31) by means eta. compression spring 33. 1 purportsto showtne guard-1 ope-rative alter having'been tripped. 'Thetrip lever :5ft is. pivoted at 39, and connected by means. of a connecting linkc, with one arm Alu, ora bell crank 4.1. The. lint` 40- is; conveniently made adjustable lengthwise for. thel purpose. otv varying the, relative. positions. of the catch. and trip! levers 36 and 3'! respectivelv'.Y The bell crank is so.l disposecl thaty the other. arm. Mbthereoi extends beneath. the` link 2.6. Accordinglys upon the guard 28 being tripped. in an emergency, the catch. lever 35i disengaged. from the trip. lever 3l with theY result that. the latter turnson its pivot 3.9 under the. inuence ci. the. compression spring, 3,8..A Conseduently the bell crank, al. is rocked. clockwise (Eig. 1`) to, raise the link 25 disengage itA from tno. pin 23.. Instantly, the. clutch is disconnected and. the, brake applied. through operation of spring M. on, lever lli..

For the. purpose of resetting Ythe mechanism after. stcnnese ofV the. machine. in. an emergency, ay handle 4.2 provided. on the top. of, the trip lever. 3l; (see. more,particularlyj Eig. 3).... f By Bulb ing this handle, forwards in a. direction. toward the guard' shaft 34 the catch lever 35 is.`reen caged. rWith the, element. 3io with the assistance of the. spring. die'. The next movement o. the

treadle then results in automatic, reengagement of the link Ztivi'th the. pin, zo whereby conncction between the levers f6 and' 2].. isreestab lished. In Fig, 1' the normal inoperative posi.- tion of the hell' crank 4|.,i's`indicated in.. db tlie lines. v

As shovvn.A in Fig, 2, the clutch-operating lever il? is shaped approximately like. a crossJv One arm lita thereoi connected4 with the; shipper cone, IT74 another: with link` 25 of the tneadle meollanism., another; Elib with. the link 26., While the I fourth lfc. carries in. its head.- Alle one end'. of. a link. toggle or like device,A suchas @t (Fig. l) adapted (when the lever i6. turns to distan-gage the clutch) to effect application of a. brake band t5 to a brake drum dii'. This. drum constitutes .59 latter., saidstop device` being alsoiopeirative to an integral part. of` theA rotary clutch housing 2'3".. The bandi 4'5 is passed' around. the druin andi connected at one end to, an element lli and at the. opposite. end to a shoe Which is adapted to be rendered. operative and.r inoperative by rmeans of thedevice M., Theelernent 47 is movable With.- in a iixeclV` part 49 of'the machine frame andlccntrollecl by a spring 50, which is adjustable bv means of the nuts Sli. The normal position of the element; 1H isV determined by the 'nuts 52 which constitute an abutment and normally rest uponthet'op. ofthe part 49.'. Thus, whenever the device Mfg is operated to apply thebrake., the nuts 52; are liftedL awayfrom the fixed' part 49 andthe springk 5ll-i`s slightly compressed, thereby enabling f having; a. shaft, power ymeans fon the brake-hand to: be drawn. about; the drumrl yielding-ly.,- 'Iflie -cilutehhousing and integral brake drum together; with. the. shaft. 9: .constitute the drivel` for the table 3, 5 of the: mazchmev As. will be.undenstood;l therefore. in. the event ci the guard 2B; being: trippedin am emergency; not-only-V is the clutchyinstantligdisengaged but the.- brahef is. simultaneously- .appliedi Each, time thesafetymecnanisxnisglcronsfht.intoy action, .howeven, itis.. necessary, tdncsetthesame; through. the handle; 42,.. inthemannen.- previonsly gdescri'bedfy before.I the. machine can, be; used. againf... f'

Havingf fullyr described invention. what.: I

claim asr new/ and'. desirefto secure byLetters. Paitent.oiitheUnitedStateszis;

1. Ifn a machine otthe characterY described, a shalt, means: fondriving;v the shaifmg a'. stop mortion: device having, connections to; the` driving mea-ns. to effect disconnection-of; the latter' with respect to: saidshafit; to stopj the latte-rg. sai-d: stop device; being also openative toilockythe-shaftnat a predetermined poi-nt; in the rotation; tliereogla manually controllable: member foninitiatingi an opera-tion ot thev machina. a.. moiable guard in po;- sition to. be contacted by the: hand'. or thel oneratoig. andr means operated-,bythe gaand to: discon;- tinue.- the application of. powertothe shaft, while thesston motion; device remains operative condition-.f

2f.. amachine ofthecharacter described', a

ion initiating an. operation; o-fthe' machine, ra

movalclcguard in posi-tionA to be: contacted bythe hand; ot the` opera-ton, and moana operatedl by: the

guard todiscontinuel thefanplication of power to` the shaft'.v and to.appiy the brake tmy the shaft, While the: stop motion. device. remains im potent tially. operative cond-itiorn 3.. ln.. afmachine ot the: charactsn described; a shaft, .meansior drivin-g;l the shaft-ot thee machine,A a stop motion dovicefha-ving; connections to. the. driving rneanato eiect disconnection of the latter with respect to said shaiitto stop the lock the. shafty at a; predetermined point in the cyclethe.combination of a saiety/ devicecomprisV ing ar movable guard member, a. brake device coimirising4 a brake band`v andi anhand, tightening member.` to. prevent overrun. of moving parts eff the machina. connections between guard meinten and saiddriving means to discontinue the aoplication of. power to. .thernachine; andconnections. between, the guand. member and the brake, hand tightening member to` initiate appli cation ci the4 latten, in .cascine-guard membeif'is moved loylthe hand of.. the. operator. Whilefth-e stop. motion device remains` in. potentially. operan tive condition. i. f H

. lellnthemachine. of `the character described, driving the shaft, and, a. brake. den-icefor con-trolling. said shaft,. thefcombination. of. a controllable member tor effecting operation. tlae brake; a strip. mQtiQn device, to. stop and., holdf the shaiitaft a predetermined. point. in. the rotation thereof; said; stop; motion device? comprising, asile@ leven, means. for ,releasably connectingthemanually controllable member.' and said. stonfleven. and a, guard meinten operative. to trin the relcasable potentially connecting means and to initiate disconnection of said power means and application ofthe brake while leaving 4'the stop lever in potentially operativercondition. e Y i 5. A machine constructed according to claim 4, in which a bell crank lever is arranged to be operated bythe guard member to trip the releasable connecting means between the stop lever and the manually controllable member forv the brake. 6. A machine constructed according to'claim 4, inv which a Vlink is providedas the releasable connecting means between the manually controllable member for the brake and the stop' motionlever, so that tripping of the link by the movable guard member results in disconnection of power means and application of the' brake while leaving the stop lever in potentially operative condition.-

7. In a power driven machine provided with a clutch, a vstop motion `member V.and a manually controllable member vfor throwing inthe clutch thereby initiating` an operation of the machine, the combination of a movable guard in `position to be contacted'by' the hand of the operator, a clutch operating member, a releasable connecting member between said clutch member and said stop vmotion member, and operative connections between the guard and said connecting membel` to release the latter thereby to initiate movement of the clutch to non-clutching position, while the stop motion member remaining in potentially operative condition when the clutch is thus disengaged. Y l 8. In a power driven machine provided with a clutch, a stop motion device and amanually controllable member for alternatively engaging and disconnecting the clutch, the combination of a guard adapted to be moved by the hand of 'the operator, said stop motion device comprising a member operatively connected to said manually controllable member rnormallyto move with the latter, and operative connections between the guard and said manually controllable clutch member to'initiate disconnection'of the clutch when the guard is moved by the hand of the operator; said stop motion device remaining in potentially operative condition whereby the parts driven by the clutch will be stopped at a predetermined place in the cycle upon disconnection of they clutch. p

9. In a power driven machine provided with a clutch, a stop motion device and a manually controllable member for alternatively causing engagement and disconnection of the clutch, the combination of a guard vmember adapted to be moved by the hand of the operator, Ysaid stop motion device comprising a member releasably connected to the manually operable clutch controlling member, and connections controlled by the guard to trip the releasable member thereby to initiate disconnection of the clutch when the guard is moved by the hand of the operator, said stop motion device Voperating normally tostop the driven parts of the machine at a. predetermined place on the cycle.

10. In a power driven machine provided with a clutch, a stopmotion device and a. manually cony trollable member for alternatively causing engagement and disconnectionv of the clutch, the combination of a guard member adapted to be moved by the hand of the operator, said stop motion device comprising a lever associated with said manually controllable lever, a releasable link operatively connecting the clutch operating member and; stop motion lever, and an Yoperative connection between said guard member and said link to move the link to inoperative position thereby disconnecting the clutch operating member and the stop motion lever from each other, whereby the guard member may initiate disconnection of the clutch while leaving the stop motion device in potentially operative condition.

11. In a power driven machine provided with a clutch, a stop motion device and a manually controllable member to operate the clutch for initiating an operation of the machine, the combination of va guard member adapted to be moved by the hand of the operator,V said stop motion device comprising a lever associated with the clutch operating member, a releasable link operatively connecting the clutch operating member and the stop motion lever, a trip member for moving said link to inoperative position, and a connection between said Vguard member and the trip`member whereby the latter is arranged to be operated by vsaid guard member to effect disconnection of the link which operatively connects the clutch operating member and said stop motion lever so that the clutch may be disconnected while leaving the stop motion device in potentially operative condition.

12. In a powerl driven machine provided with a clutch, a stop motion device, and a manually controllable member for initiating an operation of the machine, the combination of a guard member adapted to be moved by the hand of the operator, `said stop motion device comprising a lever associated with said Vmanually controllable member, areleasable link operatively connecting the manually controllable member and the stop motion lever, a spring-pressed trip member operative to move the link to effect disconnection between said manuallycontrollable member and stop lever, and connecting means between the guard member and said trip member whereby the latter is released to become operative when the guard member` is moved by the hand of the operator. j

13. In a machine ofthe character described, comprising power driven means including a clutch and a brake, the combinationof a stop motion device effective to stop and hold the power driven means at a predetermined place in its cycle, a clutch operating member, a releasable connection between the said clutch member and the stop motion device,.and a safety device comprising a movable guard having connections to eiect release of the clutch and application lof the brake and yalso to break said connection between the clutch member and the stop motion device. while leaving the stop motion device in potentially operative condition. i

14. In a machine of the character described, power means comprising a clutch and a brake for operating the machine, a stop motion device, a control member for operating the clutch and brake, a pair of links releasably connecting the clutch operating member and said stop motion device, and a guard member having connections to trip one of said links whereby the clutch may be renderedinoperative andthe brake applied while leaving the stop lmotion device in poten tially operative condition.

15. In a machine of the character. described, comprising a shaft, a clutch, and a brake, the combination of a stop motion device to determine the extent of rotary motion of the'shaft, a manuallycontrollable lever'for operating the clutch and brake, a linkv releasably connecting the clutch operating member and said stop motion device, and a guard member having connections to trip said link wherebythe clutch may-be VrenderedLinoperative and the vbrake applied without aiiectiifig the operative connection lof the stop -motionfdevice with respect to the shaft to tbev stopped.l

16. In a .power driven machine ...provided wih a shaft, abrake., a clutch, a stop motion device and a manually controllable member for initiating an operationoi 'the machine, the combination of aguardladapte-d to be moved by 'the hand of the operator, a lever ymembermanually operable to releasethefbrake'and to engage the clutch to initiate operation or" the. machine, said istop motion device comprising a lever associated with the clutchoperating lever, a releasablellink operatively connectingthe clutch operating leverv and the stop motion zlever, and a connection between vsaid-guard and the releasabie lin-k'toeifect .disconnection Aofthe link thereby to .initiate release vof the clutch and application'of'the `bra-ke withoutinterrupting,the action of said stop motion device. Y

17. In a 'power driven machine `provided with a shaft, a brake, a clutch, ya `stop rmotion .device and a manually controllablemember for vinitiating-an operation -of the machine by Areleasing .the

brake rand engaging the clutch, the combination of a guard 'adapted to r.be imoved by the hand of the operatorpa lever member-manually operable to move the clutch to initiate operation of the machine, said stop lmotion device comprising a lever associated with the clutch operating lever, a pair of releasable links operatively connecting the clutch operatinglever Aand the stop motion lever, a trip member operative to move one ofthe links to eiiect disconnection'between the clutch and Vstop levers, and connecting means between the'gu'ard and said trip member whereby the latter is operated whenthe guard is moved by the hand of the operator. Y

18, In a power driven machine provided kwith a clutch and a brake, a clutch operating member, a stop motion member, and a manually controllable member for releasing the brake and engaging the clutch to start the machineA in operation and, alternatively, for disconnecting the clutch and applying the brake, the combination of almovable -guard in position to becontacted by the hand of the operatona releasable connection between the clutch operating member and the stop in. tion member, and connections between the guard and said manually controllable member `to initiate disconnection of the clutch and application of thebrake, said guard at the same time operating lto release said releasable member whereby the stop motion device remains operative when the clutch is thus disengaged.

19. In a power driven machine provided with a clutch and a brake, a stop motion device and a manually controllable member for releasing the brake .and engaging the clutch to start the machinel in operation and, alternatively, for disl connecting the 'clutch and applying the brake,

the combination of a guard adapted to be'moved by the hand of the operator, said stop motion device comprising a member operatively connected to said manually controllable member normally to move with the latter, and connections between the guard and said stop motion member to trip the latter to initiate disconnection of the clutch and application of the brake when the guard is operated by the hand of the operator, said stop la clutch anda brake, a fstop motionnevica1and 'a manually-controllable member'for 'releasing-the brake .and engaging fthe clutch to start operation of the -machine,-`th`e combinationlof aguard member adapted tobefmoved rby the -fhand of *the operator, said stop motion device comprising a notched disk -and a locking 'member cooperating therewith, a releasable connection between -said locking member `and said manually controllable member, a spring holding said locking member pressed against the periphery of the 'disk and operative to cause the said member to drop into a ynotch in the disk, and connections between the 'guard Amember and saidTeleasable-connection yto -trip thelatter thereby to initiate disconnection ci the clutch and application of the brake .when the guar-d is 'movedby'hand-A of the' operator, without interfering with lthe `action of the stop motion device.

inglyV against said smooth surface, a releasablel connection between the stop member and the said clutch operating member, whereby said springtends constantly `'to move'said clutch member in a, direction to releasetheclutch, and a safety de vice comprising a movablefguard'having connectonstoV effect Telease'of said 'releasa'ble connection so that said spring jbecomes operative to .ef-

motion device remaining operative whereby the member driven by the clutch will be stopped at a predetermined place in the cycle.

20. In a power driven machine provided with fectdisconnection of the clutch upon 'movement ofsaid guard. l v

22. In' Aa machine 'oi' the character described, a worktreatingmember, a work presenting member movable between workreceiving and work presenting positions, a stop motion device to determine eachposition of Vsaid work'fpresenting member, power means 'comprising a clutch for operatingsaid work Vpresenting'memberl a manually contrcllable'member'for 'operation of the clutchga releasable connection betweensaidmanually'controllable member and the stop motion device, VVand a guard Ymember adapted to' be operatedibytheha'nd ofthe operator and having a connection *to* trip said releasable connection whereby'the clutch may be disconnected without aiTecting the action'of fthe stop motion device.

23. Ina 'machinerfor operating on .sheet material, a work'treating member, ya work presenting membenpower means for operating said work presenting member between work receiving-and work presentingpo'sitions', said meanscomprising a clutchand a brakenmembermovablein one direction to release the clutch andapply the brake, a stop motion device effective to hold the work presenting member in either of its two po-v sitions, said device including a member having a smooth surface with regularly spaced notches therein and a stop member to engage in such notches one at a time to determine exactly the said positions of the Work positioning member, a spring having connections to said stop member to hold it yieldingly against said smooth surface, a releasable connection between the stop mem- 21. In a machine "of the .character described; y

ber and the said movable member for theclutch and brake, whereby said spring tends constantly to move said movable mem-ber in a direction to release the clutch and apply the brake, and a safety device comprising a movable guard hav-` ing connections toinitiate release of said releasable connection so that said spring becomes operative to effect disconnection of the clutch and application of the `brake upon movement of said guard. n

24. In a machine for operating on sheet material, a work treating member, a work presenting member movable `between work receiving and work presenting positions, a stop motion device to determine each position of said workv presenting member, power means comprising a clutch andY a brake for operatingl said work presenting member, a manually controllable member for operating the clutch and brake, a releasable connection `between said manually controllable niem.- .n

ber and the stop motion device, and a guard inember adapted to be operated by the hand of the operator and having a connection to trip said releasable connection whereby the clutch may be released and the brake applied without affecting the potentially operative condition of the stop motion device.

25. In a machine for operating on sheet material, having means for treating a work piece and provided with a work presenting member, power means comprising a clutch 'anda brake for moving said work presenting member between work receiving and work presenting positions, the combination of a stop motion device comprising a locking member for automatically terminating movement of the work presenting member in each of its directions of movement, a combined clutch and brake controlling member, means for releasably connecting' theV combinedV .clutch and brake member with said locking member, and a guard member having connections to trip said connecting means whereby the clutch-L may be released and the brake applied Without affecting the potentially operative condition of the stop motion device by said locking member.

26. In a machine for operating -on sheet material, a work treating member, a work presenting member, power means comprising a shaft, a clutch and a brake for operating the work presenting memberk between workreceiving and Work ,y

member from the stop motion member whereby said clutch and brake member may effect disconnection of the clutch and application of the brake without affecting the potentially operative condition of the stoprmotiondevlce.

2'7.Y In a machine for operating on sheet material, a shaft, a brake for the shaft, means for driving the shaft, a stop motion device to stop and lockv the shaft at a predetermined point in the rotation thereof, a releasable connection between said stop motion device and said driving means, a guard adapted to be moved by the hand of the operator to release said releasable connection, a manually operable member for controlling the vshaft driving means to initiate and terminate operations of the machine, a member for treating a work piece, a work presenting means movable by said shaft between work receiving and work presenting positions, and connections between the guard and said manually operable member to terminate the application of power to the shaft by said driving means and to apply the brake to said shaft when the guard is operated by the hand of the operator, said stop motion device remaining operative, by reason of said releasable connection, whereby the shaft will be stopped at a predetermined point in the cycle.

28. In va machine for operating on sheet material, having a driven shaft and a clutch and albrake, the combination of a stop motion device for the Shaft, a manually controllable member for effecting disconnection of the clutch and application of the brake, said stop motion device comprising a stop lever, a releasable connection between the Stoplever-and said manually controllable member, a spring tending constantly to move the manually controllable member and the stop lever to operative position thereby to render the stop motion device operative, a guard member operable by the hand of the operator to serve asa safety device, and a spring pressed trip lever arranged to be released by the guard member and operative in turn to eiiect tripping of said releasable connection whereby the clutch is disengaged and the brake applied without affecting the Vpotentially-operative condition of the stop lever'. Y y' 29; In a leather boarding machine having la pair of `rolls fortreating a piece of leatherv and a work presenting table movable between work receiving and work presenting positions with respect to said boarding rolls, the combination of driving means for the work table, a stop motion device to control the driving means to terminate the motion of the work table vand bring it to rest alternately in work receiving and work presentingpositions, abrake anda clutch device associated with said driving means, a manually controllable member for operating the clutch and 'l the brake device, a releasable connection between said manually controllable member and the stop motion device, and a guard member having connections to said releasable connection to trip the latter to initiate disconnection of the clutch device and application of the brake device without affecting 'the potentially operative condition of the stop' motion device.

v GUSTAV A. SCHETTLER.

5 CERTIFICATE oF CORRECTION. Patent No. 2,550,928. october 5,` 1915,

' GUsTAv A. SCIIETTLER.

It is hereby Certified that error appears in the printed specification of the above numbered patent lrequiring Correction as follows: Page l, first Column, line 1TB, for "applicant" read --appliCation--; page lp, first co1- umn, -line 29, claim T, `sstrike out the word "while and that the said Letters Patent` should be read with this correcti on therein that thesame may conform to the record of the Case in the Patent Office.

Signed and sealed this l8th,day of' January, lA. D. 19h11..

Henry Van Arsdale, (Seal)A Acting Commissionenof Patents. 

